Is Iron Safe with Armour Thyroid?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Space Armour Thyroid and iron supplements by at least 4 hours. Take Armour Thyroid first on an empty stomach. Have your TSH rechecked 6-8 weeks after any change in iron supplementation.
Why this interaction occurs
Iron salts form stable, poorly soluble complexes with both T3 and T4 components of Armour Thyroid in the gastrointestinal tract. This chelation interaction can reduce effective thyroid hormone absorption by 30-50%, potentially leading to clinical hypothyroidism and requiring dose increases.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 159,660 reports mentioning Armour Thyroid. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Armour Thyroid + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Iron interactions → · All Armour Thyroid interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.